JPS58153450A - Method for converting resolution of facsimile information or the like - Google Patents

Abstract

PURPOSE:To convert resolution so as to obtain fine picture quality with a simple algorithm, by processing a picture element and a line to be thinned and a picture element and a line to be added together with the adjacent picture elements and lines by an OR means. CONSTITUTION:A logical operation part 6 converts decoded facsimile information at its horizontal picture element. After completing the processing of one line, the information stored in a line memory 7 is shifted to a line memory 8 and the succeeding line is stored in the line memory 7. When the information in the line memories 7, 8 is not thinning lines, the information is sent in a recording part as it is, but if a thinning line exists, the thinning line is compared with the preceding line and OR operation is executed. The processed result is stored in a line memory 9 and then sent to the recording part.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Description of the field to which the invention pertains The present invention is a resolution conversion method for 7-axis information, etc., which is simple in S configuration and has relatively good image quality.

(2) Description of conventional technology As the conventional ζomo resolution conversion method, some of the original images
An arithmetic method in which the WA element of the converted image is determined as the result of the calculation of the H element, and a selection method in which the pixels of the original image are selected according to a predetermined 9 algorithms, and the selected pixels are used as the pixels of the 11 converted image. Can be divided.

For both methods, as shown in Figure 1, the original image 0(l
There is a projection method in which the converted image C (broken line) is projected onto a converted image C plane (dashed line) having a different resolution, and the value of one pixel (shaded area) in this picture area is determined by the accumulation of the area ratios of the original IN lines. The projection method has characteristics such as the connection separation of the figure components of both images in the converted image and less loss of information, but since these numerical calculations are required for each pixel, the amount of processing for - pixels is reduced. It is quite large and difficult to use as a practical device.

As the latter method, there is a two-periodic scanning line processing method.

The conversion diagram in this case is shown in tJ2 diagram, which shows the converted pixel (
The value of the pixel (white circle) is determined by selecting the closest original pixel (black circle). Since the relative positional relationship between the original kite element and the converted pixel changes periodically, it is possible to form a simple logical expression using the density of the original image O and the density fK of the converted image C.

This latter method has a feature that the conversion algorithm is simple and one circuit configuration is easy, but the disadvantage is that the quality deterioration due to conversion is somewhat greater than that of the projection method.

(3) Purpose of the Invention The purpose of the present invention is to provide a resolution conversion method that uses a simple algorithm that eliminates these drawbacks and is characterized by improved image quality. It will be revealed on 112th.

(4) Explanation of structure and operation of the invention FIG. 5 shows an embodiment of the invention. FIG. 5 is an example of conversion from a 7×7 matrix to a 6×6 matrix. That is, when converting from a 7x7 to a 6x4 matrix configuration, 6 pixels are selected at the stage of advancing 7 pixels in the horizontal direction, and 6 pixels are selected in the vertical direction by advancing 7 scanning lines in 9 stages.

In other words, 1 m element in 7 mi elements and 12 ins in 72 inches.

In the present invention, pixels and lines are separated by 1, and i1 is added.
This is a conversion method that processes votes and lines by ORing them with adjacent pixels and lines. That is, in the example of FIG. 5, when converting from 7×7 to 6×60 matrix structure, the 71i-th element and the 7th twin become the logarithm of the spacing. In this case, the sixth pixel is the adjacent pixel, and the sixth twin is the adjacent 2-in. From the 1st gm pixel in the horizontal direction to the t85th pixel, and from the 12th in to the 459th in in the vertical direction, the information (A to Y) of the original image becomes the information of the t-converted image. In addition, the j14th pixel of the original information and the 7th WJ pixel (a and a', b and b'--e and s') o
A logical sum is taken at the function, and this result constitutes the 6th element of the converted image.

Also, in the vertical direction, f! The logical OR between the J6 line and the 7th line is taken, and this result constitutes the 62nd in of the converted image. That is, the 62nd in of the converted image is expressed by the logical sum of the relationships A and I'1 口 and 口', H and HA', . . . HO and HO'.

In FIG. 6, each pixel at the intersection (1 to lv) of the 6th pixel, the 7th pixel, the 62nd in, and the 7th line is 4[l out of l
If black information is lost even in the l1i element, the pixel at the intersection of the sixth pixel and the sixth lie/th line at the time of conversion becomes black information.

FIG. 4 is a matrix showing pixel positions after conversion.

Until A-Y! Information about the Ii image is entered in that tt. 6th pixel (a#~@#) and! I6 line (I'~ho") and
The intersection point (■) is the converted information. In addition.

In the part 1 to lv O in Figure 5, M is obtained by taking the logical sum of the whole as mentioned above, but n (n>1
) If the pixel is black or more, it can be treated as black information. For example, in Figure 5, U fll and (11) or ill and f
When llll is black, (v) in Figure 4 is black information, (1) CIll (when ill is black, M in Figure 4 is black, or (1) to (lv) when all are black KM can be set to black.The conversion of the intersecting point between the pixel and the line which are intersected in this way can also be obtained by logical product of the pixels of the fixed part among each pixel of the original information. This method reduces the probability that the image will be distorted in black than when calculating the logical sum between the four pixels, making it possible to improve the quality.

FIG. 5 shows a circuit configuration diagram of the converter on the receiving side.

Reference numeral 1 denotes a decoder block which decodes facsimile encoded information into a high resolution image, and 2 a resolution conversion processing unit.

5 is a recording section, 4 is a transmission control section, and 5 is a terminal control section.

The decoding information from the decoder section 1 is sent to the successive conversion processing section 2, where the decoding information is subjected to resolution conversion processing and then sent to the recording section SVc to generate a received image.

The transmission control unit 4 receives information such as mode power setting during communication,
Settings are made to obtain a converted image from the received image.

The 19 terminal control section 5 controls the terminal to operate in the 19 mode set by the transmission control section 4.

The configuration of the resolution conversion processing section 2 is shown in FIG.

In FIG. 6, reference numeral 6 denotes a logic operation unit that performs horizontal pixel conversion processing of the decoded facsimile information.
i-moto! 1!71! Output the result of the logical sum operation and store it in the line memory 7. When the processing of one line is completed and the fcR floor is reached, the information stored in the line memory 7 is as follows.
Another line memory aK is shifted and the secondary 2-in is stored in line memory 7. Next, the information in the two in-memories 7 and 8 is sent to this t mark section 5 if it is not a line of interest, that is, in the case of the 1st line to the 5th line in the example of FIG. If there is a line, i.e.
When the 7th line is decoded in the example shown.

Compared to that # line, i! A logical sum calculation process is performed. After this result is stored in line memory 9, it is sent to signal s5. 11 is a changeover switch, and based on the changeover switch control unit 100 command, 1! , contacts 1 and 1'
Switch. 1 is connected to 11 when there is no Sekiki I-)in, / is connected to 11 when there is a logical sum operation result. This switching is controlled by the changeover switch control section 10.

Next, the intersection point 11 between the horizontal direction and the vertical direction where a logical operation is performed will be described. In this case.

In the logical operation section 6 of FIG. 6, it is preferable to represent the four states before the logical operation in the horizontal direction with 2 bits. In other words, four states are displayed depending on whether the information in 0fil(Ill) in FIG. By keeping the twin that is the target of logical operations, line memory 7
and when stored in 8, compare 12 and 13 and 2
Data after image processing can be obtained.

(5) Description of Effects As explained above, the present invention is applicable to mutual communication between terminals having different resolutions on the transmitting side and the receiving side.

Since the resolution conversion process within the terminal device can be easily performed and images of good quality can be provided, there are advantages such as being able to sufficiently cope with the appearance of terminals with various resolutions.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are conceptual diagrams of a conventional conversion method. 3 and 4 are conceptual diagrams of resolution conversion according to the present invention,
FIG. 5 is a block diagram of a receiving-side converter including a resolution conversion processor, FIG. 6 is a block diagram of a converter, and FIG. 7 is an explanatory diagram of a decoded image information format. In the figure, 1 is a decoder section, 2 is a conversion processing section, and 3 is a sign #fiG.
, 4 is a transmission control section, 5 is a terminal control section, 6 is a horizontal logic operation section, and 7, 8.9 are line memories. Reference numeral 10 indicates a changeover switch control section, and 11 indicates a changeover switch. pHID Sai2ki

Claims (1)

[Claims] (1) In a method that performs *S**W*O conversion to a low-resolution image between a transmitting terminal and a receiving terminal, horizontal QII elements occur due to the difference in input and output m5io resolution LL. and the vertical oilst distance.
Information about the # adjacent to the target pixel or the next pixel and 2 intervals <target scan! The information of the previous or subsequent scanning line that is in contact with IKIjI is the information obtained by combining the information of the horizontal pixel separated by 1 and the information of the pixel of the previous or subsequent pixel of the target pixel KIIM. and the vertical scan spaced by 1, and the information obtained by disjuncting the information of the previous or subsequent scan line adjacent to said space (the target scan), respectively. A zero-resolution conversion method for facsimile information, etc., characterized by preventing loss of information due to Regarding resolution conversion, there is a resolution conversion method for factor jlJ information, etc., which is characterized in that the pixel after the conversion is determined to be black or white according to the number of black or white information occupied in the pixel information before conversion. .